Fix SVG upload

[bembelimen]

Pull Request for Issue #37439 .

Summary of Changes

• Invalid SVG files with broken structure
• Allows comments in SVG files

Testing Instructions

Allow svg in the media manager options (mime: image/svg+xml, extension: svg).
Take the file package from @brianteeman #37439 (comment) and try uploading the files.

Actual result BEFORE applying this Pull Request

bad1.svg + bad3.svg is uploaded (both should be blocked), bad2.svg (false positive) + bad4.svg is rejected

Expected result AFTER applying this Pull Request

only "bad2.svg" is uploaded all other files are rejected

@woluweb could you test please?

[brianteeman]

I have tested this item ✅ successfully on 7d05411

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[toivo]

I have tested this item ✅ successfully on 7d05411

Tested successfully in Joomla 4.1.3-dev of 30 April in Wampserver 3.2.8 using PHP 8.0.15

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[chmst]

RTC

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[akshitrattan]

I have tested this item ✅ successfully on 0816b10

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[bembelimen]

Thx for testing